Runner for grinding plate-glass.



W. R. VALENTINE,

RUNNER POB GRINDU 1G PLTE GLASS,

APPLICATION FILED JALGJQu.

FIG

W. R. VALENTINE. RUNNER FOR GRINDING PLATE GLASS. APPLICATION FILED JAN.6, 191x.

l 1 O1 ,O4-6. Patented June 23, 1914 ssamm-snm; a. @I X XOXYOXO" F l E -5 maxaman V -OXYO #Qggx more.; L

WITNESSESI /7 f' A ,l mvsuTon iff w v, Y hij, 7 561i? L. it

'or discovered cent-ain new and useful Imv`Glass of which improvements the following ineens, Aand the runners are usually fric- 'plished by a suitable grit, (usually sand or grinding, or ifprotected from such ingress :to bear unevenly upon the glass. This causes not only uneven-grinding, but uneven wear- Umrnn s'rafiss.

R. VALENTINE, OF FORD CITY, PENNSYLVANIA.

RUNNER FOR GRINDING PLATE-GLASS.

'Specification of Letters Patent.

Patented June 23, 1914.

Application led January I6, 1 911. Serial No. 601,148.

To all whom 'it may concern:

Be it known that I, WARREN R. VALEN- TINE, residing at Ford City, in the county of Armstrong and State oit Pennsylvania, a citizen of the UnitedV SEitcs,`have invented proveinents in Runners for Grinding Plateis'a"specification.-

Inthe operation of grinding plate glass, the unground plates are laid edge to edge upon a horizont-al rotatable tableLand are cemented or otherwise secured thereon. Rotatably suspended above the table are one or more runners, usually of circular form',` having a grinding surface made up of iron blocks which bear upon the surface ot the' glass. f The table is rotated by suitable tioiially rotated, the grinding being accomcinery), mixed with water, which is fed upon the surface of the glass, and becomes interposed between the glass and the runnerblocks. In order to` in e'. measure cushion the runner-blocks they have usually been secured to a wooden deck, the upper face of which has either been more or less open, and thus exposed to the water and grit used in of Water and grit, the protection has been of such a character as to permit localized lodgment of grit thereon. The Weight of such lodged grit frequently causes the deck ing of the runner-blocks, so that the latter must be frequently renewed. Also, it being necessary to use different grades of grit in successive steps of grinding a plate, it has been difficult to thoroughly cleanse the runner between steps; the, resultv Often being that coarsegrains of grit become mingled with the iner grains intended to be used, thereby scratchingl or otherwise inarring the glass. n p

'It is the object of the invention to overcome these difiiculties, by providing a grinding-runner in which not only the deck is practically closed against the intrusion of water and grit,and the upper surface of the closure is so formed as not to permit lodgment of grit thereon, but the frame of the runner is practically rigid, so that there will be little or no warping, sagging or coI iorming to the uneven thickness of the glass, and

the runner-blocks will bear uniformly upon the glass so as to first grind away the thicker portions or excrcscences and reduce the glass to uniform thickness and then' grind evenly over theV entire surface. Thus the grinding will be uniform, and the runner-blocks being worn down uniformly, will have a much longer life. Also by providing a new shape of runner-block a more even distribution of the grit is accomplished, and thegrit is in great measure prevented from fiying out rom under the runner.

In the accompanying drawings formin .a part of this specification, Figure 1 is a p an view of a grinding-runner embodying the invention, with the central cap removed.

Fig. 2 is a sectional view on the line Ill-II of F ig. l, showing the cap in place.4 F igs. 3 and i are viewsin elevation and inverted plan respectively, of a portion of a runnerbar, showing the improved shape of runnerbar. Fig'. 5 is an inverted plan view showv ing a. portion of the grinding-face of the ruimer.

The runner is provided with a frame 1, which may be of any suitable form, of substantial rigidity, and is herein shown as a single iron casting of the forni of a circular inverted box, open at the center, so as to have an annular web 2, and the arms 3 branching from the central boss 4With supplemental arms or ribs 5 depending froml curately finished to provide an even bearing surface for the planks which make. up thc wooden deck v9, and which are Secured beneath thc flanges in any suitableway, as by means of bolts l0, the lower heads of which, (not shown), should be countersunk in the planks. preferably el" a slightly tapering .hexagonal form, are formed on the cast iron runnerbars i2. These bars may be fastened to the lower face of the deck 9 by any suitable means, as by screws 13 passing through holes 14 inthe bars, thus forming collectively a metallic grinding-shoe.

The cap 15 may be of any suitable forni to close the opening in the top of the runner, and to permit of its rotatable suspension. It is herein shown as an iron casting The `runner-'blocks 11, which are -30 down substantnallyto thesu 35 results will be secured.; And I also to so arrange the runnr-bars that t dividuall blocks will,stand staggered having a centralsshaft 16 and an out rdly `flaring skirt 17. -The edge of the slqrt is bolted to the boss 7, as shown, so that the annular web 2 and the cap 15 together form 5 a. closed impermeable roof for the runner,

preventing access of water and grit from 1abovev upon the deck 9.v The web 2 also preferably slopes outwardly from the boss 7,

and the roof as a whole is free from grit- -retaining projections upon'its upper surface.

The depending end of the shaft 16 within the cap may also be bolted to the central boss 4, as showin.l The runner may be pro.-

vided with'trunnions 18 fastened in blocks 19 forIned-atopposite' sides of the frame 1,

if desired.A The shaft 16 may be suspended in any way suitable` to permit of the rota- \tion of the runner. y A It will `be apparent that by reason ofthe 2,0 closed vunobstructed roof not only will the deck 9 be shielded froin water and grit, but that whatever grit may get upon the upper surface of the roof will be readily throwntherefrom by the centrifugal -force of the runner and will not accumulate thereon and tend to cause local sagging of the runner. The result is that the runner-blocks wear away with substantial uniformity, and they may be used until thlev' are v'all-worn ace .ofthebara .The runner-,blocks heretoforeused have been of a rectangular circular or diamond shape. I have discoveredthat making them hexagonal in .cross-section', A valuable relation to each other, asshown 'inTF1g.5.

` I have -found that by usingrunner-blocks 40 of'v a hexagonal' form a more .uniform dis- ,tribution of." the it ver the surface of the glass` is obtaine while materially smaller.

' uantitieso'f'grit are thrown ont from under t le e es of the runner.

"A be due to the fact 'that'as-,th Ytends to pile upa ainst-r be"forced`a a from any face of a lock, as such'face ige ifted relabeneath, theit is distribut d on the one hand-,and cori ned on the oth tively to the line tif-movemer of the tablev .of adjacent blocks. Wherea w en Asquare orgdiamond sha ed blocks re use'd, the

' tendency is for t e grit'to pass by the cor-- ners of the blocks, and thusto ily outat the,4

prefer b the faces In order to attain the best results it "is preferred to form the blocks on cach bar with their adjacent Aedges standing obliquely to Y each other, as shown.v

It is obvious gaat the construction herein described may e widely varied by those skilled in the, art without departure from the essential fetu '.of` the invention as defined in the appended. claims.

I claim as m invention:

1. In 'a grin ing runner, the combination with a rigid frame provided with a centrai boss, and a deck rigidly secured to said frame, of a closed impermeable roof extending over the frame-and deck from thejpe riphery of the frame to said central boss. 2. In a nding runner, the combination with a dec having grinding blocks secured to its lower face, of a conical roei secured to and covering the upper surface of the deck and provided with a cent-ral opening.

'3. In a grinding-runner, the combination -with a metallic frame having radia arms,

an inclosin walhand a web having a centra?. opening, o a cap closing said opening. 'a wooden vdeck secured to the arms and the wall, and grinding-blocks secured to 'the deck 4. .Ina grinding-runner, thehcombinaion. ofa sup, ort provided with elongated grinfie ing`-bloc hexagonal in` cross-section and symmetrical 'about their -longitu'dlnslgA and transverse axes, the blocks beingtarre 1n aralIel rows with ilieir ,lcgitudina adj acent rowslf-said parallel rows bs'ii'n staggered relation to each other. l

In testimony whereof I have hereunto set my hand. l WARREN r.. newness/s.

lVitnesses:

` PAUL N. Cnrrcnww, ALICE A. TRIM.. 

